i don't know lads, i know sometimes a lad might be getting out of the dogs for health reasons or break up with the missus etc. but generally if someone is selling a genuine working terrier its more likely to be stroked from somewhere or has flaws that they're not telling you about.
for me anyway, half the craic is from rearing and bringing on either your own pups or friends pups
at least you know then what's gone in to them and can give them the best chance